Sound box for talking machines



1.'c. DRAKE. SOUND BOX FOR TALKING MACHINES.

APPLICATION FILED APR; 9. I920.

- Patented'Jline 13, 1922.

entree easie JAMES C. DRAKE, OF ROCHESTER, MINNESOTA, AQSIGNOR TO SEARS, ROEBUCK AND COMPANY, OF NEW YORK, N. Y..

A OORTEORATION OF NEW YORK.

SOUND BOX FOR TALKING NIAOIPIINES.

a-inane.

Application filed April 9,

T0 (4U er /r0772 it may concern Be it known that l, James G. DRAKE, a citizen of the United States, residing at Rochester, in the county of Olmstead, State of lVl'innesota, have invented certain new and useful Improvements in Sound Boxes for Talking Machines, of which the following is a specification, reference being had therein. to the accompanying drawing.

My invention relatesto sound boxes for talking machines. It has for its objects, to enable the parts to be assembled from the back instead of from the front as in present practice, thus gaining certain advantages in manufacture without sacrificing tone quality; to enable the outside rim to be made of a metal that will take plating better than the die cast material heretofore employed in practice.

I attain these objects by making the back of the box of solid metal carrying the coupling member to attach it to the tone arm,

with a groove on its inner face to receive the rubber tubular gasket usually employed, and the front of the box of a ring, having a simi lar groove on its inner face to receive a second rubber gasket, the diaphragm lying between these gaskets Whenthe back and face are placed together. Both the back and the front, around the grooves referred to, have internal, projections which alternate around the peripheries, so that they intermesh and interlock when the parts are assembled, and during assembling retain the rubber gaskets in position. thus curing a trouble now existent, of falling out of a percentage of gaskets. by this device alone, I find the mun-- ber of boxes assembled by one person. is increased approximately twentydive per cent or from one hundred to one hundred and twenty five per day.

In the accompanying drawings illustrating the invention Fig. 1 is a front View of the box assembled;

Fig. 2 is an inside view of the back ready for assembling;

Fig. 3 is a similar View of the front; and

Fig. 4 is a sectional view on a vertical line approximately diametral.

Fig. 5 is a diagram showing the development in a plane surface of the ring of intermeshing segments 3-33, 5-5-5.

In the drawings, 1 is the ring front of Specification of Letters Patent. Patgnted June 13, 1922 1920. Serial No. 372,470.

my improved box, which I make of brass, or bronze, or other metal suitable to take plating, and especially gold plating. 2 is the back, which may be of the usual die metal, and its deep recess is to get the proper weight. 9 and are the usual tubular rubber gaskets seated in grooves 7 and 8 in the front 1 and back 2, respectively. When assembled, as shown in Fig. 4, the diaphragm 11 lies between the gaskets. V

In the front, around the outside of the groove 7, are three projecting lugs 333. In the back, around the outside of the groove 8, are three similar lugs 5-5-4), and these two sets of lugs by their depth, rising each to the depth of the intermediate corresponding recess 4; or 6 in the companion part, actby friction to hold the gaskets 9 and 10 in their grooves until the parts are put together. When so put together, as shown in Fig. 4%, the lugs 3 and t alternate and intermesh and back and front are secured together by screws 12 in threaded registering openings 13 through alternate lugs and recess bottoms.

What I claim is 1. In a sound box, a front and a back, each carrying a groove to receive a rubber gasket, said gaskets, a diaphragm, a stylus lever and means for securing the parts together, both front and back being provided with projecting segments or lugs adapted to alternate and intermesh in assembly, and to surround and hold the gaskets in position during the act of assemblirr 2. In a sound box, a front composed of a ring carrying attaching means for a stylus, and a back composed of a disk fitting within said ring, said disk carrying weight suflicient for good reproducing and having a tonearm coupling member at its center, together with a diaphragm and two gaskets lying between said front and back, and alternating; are shaped segments on back and front respectively to retain said gaskets separately when assembling and by intermeshinowhen the parts are secured together.

in testimony whereof I afiix my signature.

JAMES c. DRAKE.

lVitnesses C. CADWELL,

F. L. WILLIAMS. 

